Numerical Study of Granular Scaffold Efficiency to Convert Fluid Flow into Mechanical Stimulation in Bone Tissue
Magali Cruel1, Morad Bensidhoum2, Cécile Nouguier-Lehon1
11 Laboratoire de Tribologie et Dynamique des Systèmes (LTDS, UMR CNRS 5513) , Ecole Centrale de Lyon, Ecully Cedex, France .
Tissue Engineering. Part C, Methods
|January 31, 2015
Summary
Granular packing scaffolds in bioreactors offer advantages over traditional porous scaffolds. They provide similar cell-scale stress distributions and are easier to handle and seed, aiding bioreactor optimization.
Area of Science:
- Bioreactor Engineering
- Cellular Mechanics
- Biomaterials Science
Background:
- Optimizing bioreactors requires precise control over the cellular mechanical environment.
- Understanding local stresses at the cellular scale within bioreactors is crucial but challenging.
- Numerical tools are essential for assessing micromechanical conditions in bioreactors.
Purpose of the Study:
- To evaluate granular packing scaffolds as a novel geometry for bioreactors.
- To compare the wall shear stress levels and distributions of granular packings against established scaffold types.
- To assess the efficiency of granular packing scaffolds in controlling the cellular mechanical environment.
Main Methods:
- Generated three distinct granular packing configurations using the discrete element method (DEM).
- Employed computational fluid dynamics (CFD) to simulate fluid flow through these granular packings.
- Quantified shear stress levels and distributions at the cellular scale.
Main Results:
- A linear correlation was established between shear stress and inlet velocity, consistent with existing literature.
- Normalized stress distributions were independent of inlet velocity.
- Granular packing stress distributions closely resembled those of widely used porous scaffolds.
Conclusions:
- Granular packings demonstrate comparable mechanical environments to traditional porous scaffolds.
- The ease of manipulation and seeding makes granular packings a promising alternative scaffold material.
- The employed numerical methods are adaptable for analyzing other granular packing configurations in bioreactors.
